https://slatestarcodex.com/2018/08/23/carbon-dioxide-an-open-door-policy/ https://slatestarcodex.com/2018/08/23/carbon-dioxide-an-open... gives a decent reason

https://slatestarcodex.com/2018/08/23/carbon-dioxide-an-open-door-policy/ https://slatestarcodex.com/2018/08/23/carbon-dioxide-an-open... gives a decent reason why you should care about controlling (and thus monitoring as a first step) internal CO2 levels.